What are the three processes by which oxygen from the atmosphere is used up?

Respiration-  All animals and plants use up oxygen when they breathe.
Combustion -When things burn, they use up oxygen and replace it with carbon dioxide.
Rusting - This is also called oxidation. When things rust they use up oxygen.
Decomposition - When plants and animals die, they decompose. This process uses up oxygen and releases carbon dioxide.

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